《应用声学》1984年总目录

第3卷第l一4期.目扣粉’搜‘簇 雄述与评论喃乳动物组织的超声性质研究进展·········”·······“·················”···········································……冯若1(1)声细信号处理机的现状和进展··········································”·························“···················……李昌立3(1)语声研究、现代通信与信息社会······~··…     

应用声学1987年第6卷第1—4期总目录

期页题目作者数数, 综述与评论超声生物效应及超声临床诊断的安全性·······················,·························································……冯若1(1)医用超声功率和脉冲超声场特性的测量·················································································……寿文德l(6)非线性声参数及其在超声成像中的应用··········…     

《应用声学》1986年 总目录

页数期数 者 作题目综述与评论声学悬浮技术及其应用··…····……几种人工混响装置的特性分析……风机气动力噪声与气动力设计问题现代生物医学超声工程学·····……研究报告声光相关器在雷达信号处理中的应用·························“··········································……徐介平俞宽新纵振合成超声振动系统的研究····················································……”·····…     

《应用声学》1992年总目录

第11卷第1一6期题目作者期页综述与评论、.产、.了、J于、矛心.孟‘.二﹄.二‘.人产‘、护r、户r、护‘、,‘连‘七J‘U高频空气声换能器研究现状与展望···················,···················································……王兆球张淑仪檄光超声与材料无损评价·························································································…     

一种新型的两态叠加多模Schrödinger猫态光场的等阶N次方Y压缩

本文根据量子力学的线性叠加原理,构造了由多模(即q模)相干态的相反态|{-Z_j}〉q及多模虚相干态|{Z_j}〉q这两者的线性叠加所组成的一种新型的多模Schrdinger猫态光场|Ψ⁽²⁾〉q,利用新近建立的多模压缩态理论,研究了态|Ψ⁽²⁾〉q的N次方Y压缩效应。结果发现:①当压缩阶数N=2p且p=2m(m=1,2,3,…,…)时,态|Ψ⁽²⁾〉q总是恒处于N-Y最小测不准态;②当压缩阶数N=2p且p=2m+1(m=0,1,2,3,…,…)时,如果各模的初始相位φ_j,态间的初始相位差θ_pq^(I)-θ_nq^(R)以及各单模相干态光场的平均光子数之总和 等满足一定的量子化条件,则态|Ψ⁽²⁾〉q可呈现出周期性变化的、任意阶的N次方Y压缩效应;③当压缩阶数N=2p′+1时,无论p′=2m(m=0,1,2,…,…)还是p′=2m+1(m=0,1,2,3,…,…),只要各模的初始相位φ_j满足一定的量子条件,则当两态叠加几率幅满足r_pq^(I)=r_nq^(R)时,态|Ψ⁽²⁾〉q就恒处于N-Y测不准态,始终不呈现N-Y最小测不准态和N次方Y压缩;而当r_pq^(I)≠r_nq^(R)时,态|Ψ⁽²⁾〉q始终不呈现N-Y测不准态、N-Y最小测不准态和N次方Y压缩效应。     

ErP5O14非晶玻璃的红外量子剪裁

研究了Er_1.0P₅O₁₄铒非晶玻璃的红外量子剪裁现象. 从吸收谱和激发光谱的计算比较中肯定了Er_1.0P₅O₁₄非晶 玻璃的1537.0 nm红外荧光为多光子量子剪裁荧光. 从Er_1.0P₅O₁₄非晶玻璃的可见和红外荧光发射光谱中发现激发²H_11/2, ⁴G_11/2和⁴G_9/2能级所导致的⁴I_13/2→⁴I_15/2量子剪裁红外荧光很强;基于自发辐射速率、无辐射弛豫速率和能量传递速率等参数的计算,对其量子剪裁机理进行了分析.发现起源于基态的强下转换能量传递{²H_11/2→⁴I_9/2,⁴I_15/2→⁴I_13/2},{⁴G_11/2→⁴I_13/2, ⁴I_15/2→²H_11/2},{⁴G_9/2→⁴F_7/2,⁴I_15/2→⁴I_13/2}和{⁴G_9/2→⁴I_13/2, ⁴I_15/2→²H_11/2}是导致Er_1.0P₅O₁₄非晶玻璃具有强的三光子和四光子量子剪裁红外荧光的原因.研究结果对改善太阳能电池效率有一定意义.     

氮原子在800 nm附近的同位素位移

The Doppler-limited absorption spectra of ¹⁴N and ¹⁵N atoms were measured around 800 nm using concentration modulation spectroscopy to study their isotope shifts. The nitrogen atoms were generated by discharging molecular nitrogen buffered with helium in a homemade discharge tube. The isotope shifts of four multiplets (3s⁴P_J→3p⁴D_J^o, 3s⁴P_J→3p⁴P_J^o, 3s²D_J→5s²P_J^o, and 3p²P_J^o→5s²D_J^o) were measured and their J-dependent specific mass shifts were observed and discussed.     

Theoretical study of stereodynamics for the O（3P） ＋ H2 → OH ＋ H reaction

This paper employs the quasi-classical trajectory calculations to study the influence of collision energy on the title reaction on the potential energy surface of the ground ³A' triplet state developed by Rogers et al. (J. Phys. Chem. A 2000 104 2308). It calculates the product angular distribution of P(θ_r), P(φ_r) and P(θ_r, φ_r) which reflects vector correlation. The distribution P(θ_r) shows that product rotational angular momentum vectors j' of the products are strongly aligned along the relative velocity direction k. The distribution of P(φ_r) implies a preference for left-handed product rotation in planes parallel to the scattering plane. Four different polarisation-dependent cross-sections are also presented in the centre-of-mass frame. Results indicate that OH is sensitively affected by collision energies of H₂.     

k光子Jaynes-Cummings模型的亚Poisson光子统计特性研究

本文利用量子电动力学理论,首次对 k 光子 Jaynes-Cummings 模型中单模激光场的稳态亚 Poisson 光子统计性质进行了系统研究.结果表明:在一般情况下,激光上能级相对泵浦参量 x_a 具有一个确定的阈值 x_at;当 x_a>x_at时,光场呈现亚 Poisson 光子统计;当 x_a>>x_at时,光场呈现出深度且完全恒定的亚 Poisson 光子统计.在特殊情况下,阈值 x_at-0,这时在激光腔内将直接诱发亚 Poisson 光子统计.随着 k(k≥2)值增加,阈值 x_at降低,光场亚 Poisson 光子统计程度增强.     

150keV Ar离子辐照非晶态合金表面发泡和溅射形貌研究

150keV Ar离子辐照非晶态合金Fe₃₉Ni₃₉Mo₂Si₁₂B₈、Fe₄₀Ni₄₀Si₁₂B₈、Fe₃₉Ni₃₉V₂Si₁₂B₈、Fe₇₇Cr₂Si₅B₁₆和Fe₇₈Si₁₀B₁₂,用扫描电子显微镜(SEM)观测研究了表面损伤形貌剂量变化的过程.低剂量时表面发泡形成.发泡随剂量增加受到溅射腐蚀,表面形成坑洞或针孔,针孔密度随剂量增加而增加,高剂量时,表面损伤以溅射为主,溅射对表面的腐蚀导致多孔粗糙的表面损伤结构建立,并且这些结构与靶材料有着密切的关系.     

Stability of families of probability distributions under reduction of the number of degrees of freedom

We consider two classes of probability distributions for configurations of the ideal gas. They depend only on kinetic energy and they remain of the same form when degrees of freedom are integrated out. The relation with equilibrium distributions of Tsallis’ thermostatistics is discussed.